cli informative logging

Author: ratankaliani

cli/src/lib.rs

@@ -69,7 +69,7 @@ pub async fn get_toolchain_download_url(client: &Client, target: String) -> Stri
         .json::<serde_json::Value>()
         .await
         .unwrap();
-    let tag = json["tag_name"].as_str().unwrap();
+    let tag = json["tag_name"].as_str().expect("Failed to download Succinct toolchain. Likely caused by GitHub rate limiting. Please try again.");
 
     let url = format!(
         "https://github.com/succinctlabs/rust/releases/download/{}/rust-toolchain-{}.tar.gz",